Cognitive Vergence Recorded with a Webcam-Based Eye-Tracker during an Oddball Task in an Elderly Population

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Technology

Background:

• Vergence eye movements are linked to cognitive processing and may indicate cognitive issues.
• Consumer-grade eye tracking technology offers new possibilities for monitoring gaze.
• Mild Cognitive Impairment (MCI) research can benefit from novel assessment methods.

Purpose of the Study:

• To assess the feasibility of using webcam-based eye tracking to monitor vergence eye movements in patients with MCI.
• To compare webcam tracking with a traditional infrared eye tracker for cognitive vergence assessment.

Main Methods:

• Simultaneous recording of eye positions using a consumer-grade webcam and an infrared pupil eye tracker.
• Utilizing a visual oddball paradigm to elicit cognitive vergence responses.

Main Results:

• Both webcam and infrared eye tracking methods successfully captured vergence eye movements.
• Participants demonstrated significant cognitive vergence responses, with larger amplitudes for targets than distractors.
• The study confirmed the reliability of webcam-based tracking for cognitive vergence.

Conclusions:

• Consumer-grade webcam eye tracking is a viable method for recording cognitive vergence.
• This approach has the potential to facilitate the development of cost-effective screening tools for mental health.
• Further research can build upon this method for widespread clinical application.